Remodeling
Sunroom Addition Cost Calculator
Prices a sunroom, where three-season and four-season are different buildings.
Result
A planning estimate, not a quote. Access, the age of the equipment, what is found once it is opened up and local labour rates all move the real figure, sometimes a long way.
Get a Free Business AuditHow the calculation works
Hours times crew times rate, plus materials and the call-out. A three-season sunroom is a glazed, roofed structure without heating, intended for mild weather, and it is built to a lighter standard. A four-season room is conditioned living space, which means insulated walls where there is no glass, an insulated roof, an insulated floor assembly, glazing that meets energy code, and heating and cooling. The second costs considerably more and is the one most clients actually want once they understand the difference.
What moves the number
- Three-season or four-season, which is the dominant cost decision.
- Glazing area and specification, since energy code applies to a conditioned room.
- Whether heating and cooling extend from the house system or need their own.
- Roof type, as a glazed roof costs more and brings heat gain and condensation issues.
Where this one goes wrong
A large glazed room is a thermal problem in both directions, and clients frequently discover it after building a three-season room they hoped to use year round. Heat gain in summer can make an unshaded glazed room unusable, and in winter an uninsulated one is unheatable at reasonable cost. Glazing specification, orientation and shading all matter more here than in any other room. Condensation is the related issue: large cold glass surfaces in a humid room produce running water, and a glazed roof makes it worse. Designing for the season the client actually wants, rather than the cheaper option, avoids a room nobody uses.
Before you quote
- Establish which seasons the client expects to use it before specifying.
- Specify glazing for the orientation and the climate, not the lowest price.
- Plan heating, cooling and condensation management for a four-season room.
Where the rules come from
Questions
About this calculator
What is the difference between a three-season and four-season sunroom?
A three-season room is glazed and roofed but not insulated or heated, for mild weather. A four-season room is conditioned living space with insulated walls, roof and floor, energy-code glazing and heating and cooling. The second costs considerably more and is usable year round.
Will a sunroom be too hot in summer?
An unshaded glazed room can easily become unusable in summer, and that is a design question rather than a fault. Glazing specification, orientation, shading and ventilation all matter, and getting them wrong produces a room that is pleasant for two months and avoided for the rest.
Why does my sunroom get condensation?
Because large glass surfaces get cold and humid indoor air condenses on them. A glazed roof makes it worse because the water then drips. Better glazing, ventilation and humidity control all help, and a four-season design handles it far better than a three-season room being heated.
The formula
total = hours x people x rate + parts + call-out, then sales tax
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How to use this calculator
- Hours on site (h). Enter your own figure; the page starts at 160 h.
- People needed. Enter your own figure; the page starts at 1.
- Labour rate charged ($). Enter your own figure; the page starts at $88.
- Parts and materials ($). Enter your own figure; the page starts at $11,000.
- Call-out or diagnostic fee ($). Enter your own figure; the page starts at $95.
- Sales tax (%). Leave at zero if you are quoting before tax.
The result updates as you type, so you can try a figure, see what it does to estimated total, and change it back. Nothing you enter is sent anywhere or saved.
A worked example
These are the figures the calculator opens with. Every number in the results column below is produced by the same calculation the page runs, so you can follow it through before putting your own figures in.
What goes in
| Input | Value |
|---|---|
| Hours on site | 160 h |
| People needed | 1 |
| Labour rate charged | $88 |
| Parts and materials | $11,000 |
| Call-out or diagnostic fee | $95 |
| Sales tax | 0% |
What comes out
| Result | Value |
|---|---|
| Estimated total main result | $25,175 |
| Labour | $14,080 |
| Before tax | $25,175 |
| Sales tax | $0 |
About $25,175: $14,080 of labour, $11,000 of parts and a $95 call-out.
How sensitive the answer is
Holding everything else steady and changing only labour rate charged, this is what happens to estimated total. It is worth knowing which of your inputs the answer actually hinges on, and which barely move it.
| Labour rate charged ($) | Estimated total |
|---|---|
| $44 | $18,135 |
| $66 | $21,655 |
| $88 example above | $25,175 |
| $132 | $32,215 |
| $176 | $39,255 |
Every other input is held at the example value while this one changes, which is not how a real job behaves. Treat it as a guide to which number matters most, not as five separate quotes.
What each figure means
- Hours on site (h)
- Measured in h, between 0 and 400, starting at 160 h.
- People needed
- A number, between 0 and 40, starting at 1.
- Labour rate charged ($)
- A money amount, starting at $88.
- Parts and materials ($)
- A money amount, starting at $11,000.
- Call-out or diagnostic fee ($)
- A money amount, starting at $95.
- Sales tax (%)
- Leave at zero if you are quoting before tax.
What the results tell you
| Result | What it is |
|---|---|
| Estimated total | The headline result. A money figure. |
| Labour | A money figure. |
| Before tax | A money figure. |
| Sales tax | A money figure. |
Estimating is the easy part
The jobs you never hear about cost more than the ones you mis-measure. BDEVY builds the marketing, systems and automation that bring them in.